ISO 6926:2016规定了参考声源的声学性能要求: -声功率输出的时间稳定性； -光谱特性； -方向性。 时间稳定性是根据重复性的标准偏差定义的（见5.2）。根据本国际标准（见5.4），可在半消声室或混响试验室通过测量频带声功率级来验证频谱特性。指向性指数的性能要求只能在半消声室内进行验证（见5.5） ISO 6926:2016还规定了在第4条规定的倍频程和一倍频程的参考气象条件下，提供用作参考声源的声级校准数据和不确定度的程序- 三倍频程频带，频率加权A。 ISO 6926:2016被称为校准标准，尽管该方法在测试实验室中进行，且水平校准结果不能直接追溯到严格计量意义上的国家计量标准。执行该方法的测试实验室预计不会满足通常与校准实验室相关的所有要求。 注:ISO/IEC 17025[15]分别规定了测试实验室和校准实验室的不同能力要求。根据本国际标准测试参考声源的实验室通常符合测试实验室的要求，但不一定符合校准实验室的要求。 ISO 6926:2016规定了校准参考声源的方法，不仅在反射面上方的自由场中，而且在距离边界表面不同距离的混响试验室中。 对于参考声源在一个反射面上的位置，上述两种不同的试验环境被视为等同于200 Hz以上或等于200 Hz的频带。在160 Hz及以下，可能会出现一些系统性差异（见11.2）。对于低于100 Hz的频率，给出了一种使用声强的替代校准方法。 声源可以直接放置在地板上，也可以安装在高于地板一定高度的支架上。根据该国际标准，在混响试验室中校准支架安装的声源。地面安装的声源可以在半消声室或混响试验室中进行校准。对于半消声室内的落地式声源，本国际标准仅适用于最大垂直尺寸小于0.5 m且最大水平尺寸小于0.8 m的声源。 根据该国际标准，在测量表面上进行测量时，只能使用落地式参考声源。对于在混响条件下使用或校准的参考声源，最大尺寸不受此类限制。

ISO 6926:2016 specifies the acoustical performance requirements for reference sound sources: - temporal steadiness (stability) of the sound power output; - spectral characteristics; - directivity. Temporal steadiness is defined in terms of the standard deviation of repeatability (see 5.2). The spectral characteristics can be verified in either a hemi-anechoic room or a reverberation test room from measurements of the frequency band sound power levels in accordance with this International Standard (see 5.4). The performance requirements on directivity index can only be verified in a hemi-anechoic room (see 5.5.) ISO 6926:2016 also specifies procedures for providing level calibration data and uncertainty on a sound source intended for use as a reference sound source in terms of its sound power level under reference meteorological conditions as defined in Clause 4 in octave and in one-third-octave bands, and with frequency weighting A. ISO 6926:2016 is titled as a calibration standard even though the method is conducted in a testing laboratory and the level calibration results are not directly traceable to national standards of measure in a strict metrological sense. Testing laboratories performing this method are not expected to meet all requirements normally associated with a calibration laboratory. NOTE ISO/IEC 17025[15] specifies different requirements for the competence of testing laboratories and calibration laboratories respectively. Laboratories testing reference sound sources in accordance with this International Standard would typically comply with the requirements for testing laboratories but not necessarily with those for calibration laboratories. ISO 6926:2016 specifies methods to calibrate reference sound sources not only in a free field over a reflecting plane but also in reverberation test rooms at different distances from the boundary surfaces. For the position of the reference sound source on one reflecting plane, the two different test environments mentioned above are considered equivalent for frequency bands above or equal to 200 Hz. At 160 Hz and below, some systematic differences can occur (see 11.2). For frequencies below 100 Hz, an alternative calibration method using sound intensity is given. The sound source can either be placed directly on the floor or mounted on a stand to be used at a certain elevation above the floor. According to this International Standard, stand-mounted sources are calibrated in reverberation test rooms. Floor-mounted sources are either calibrated in hemi-anechoic or in reverberation test rooms. For floor-mounted sources in hemi-anechoic rooms, this International Standard is valid only for sources whose maximum vertical dimension is less than 0,5 m and whose maximum horizontal dimension is less than 0,8 m. According to this International Standard, only floor-mounted reference sound sources can be used when carrying out measurements on a measurement surface. For reference sound sources to be used or calibrated under reverberant conditions, no such restrictions on maximum dimensions apply.